Burner



Patented Mar. 4, 1924.

EDWARD r. Canaan, or nnraorr, MICHIGAN.

BURNEB;

Application filed December 6,1920. Serial 110,428,780.

To all whom it may concern:

Be it known that I, EDwAnoT. OURRAN, a citizen of ,the United States, and a resident of the city of Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Burners, of which the following is a specification.

This invention relates to burners for gaseous fuel particularly adapted for use in connection with water heaters, commonly termed instantaneous water heaters, in which a chamber is provided having an inlet for the fuel and openings adjacent said fuel inlet for an air supply to be mixed with the gas in said chamber, and it is the primary object of the invention toprovide a burner for this purpose which is novel, cheap in manufacture and highly eflicient in use.

It is a further object of the invention to rovide a burner having a single outlet or urner portof relatively large cross sectional area as compared with the fuel inlet and the air inlet.

In burners of thischaracter in which a single jet or blast is provided the heating apparatus is so constructed and arranged as to provide an air supply at the point of combustion of the fuel at the burner outlet to increase the flame. propagation at the burner outlet. However, as the flame is relatively large this air supply at the burner outlet is only supplied at. the outer portions of the flame with the possibility of incomplete combustion of the of the flame. It is an object of the invention to so construct and arrange the burner to provide a secondary air supply to the burner at a point substantially centrally of and adjacent the outlet of the burner and at the point of combustion of the fuel.

In the drawing accompanying and forming a part of this specification, Figure 1 is a sectional side elevation of a water heater showing an embodiment of my improved burner applied thereto.

Figure 2 is an enlarged sectional side elevation showing an embodiment of my improved burner; and

Figure 3 is a view looking at the top of Figure 2 with the parts in the position they assume during the combustion of fuel.

Similar characters of reference designate like parts throughout the different views of the drawing.

fuel centrally I have shown an embodiment of my invention in the drawing in connection with,

an instantaneous water heater consisting of awater jacket 4 having an inlet 5 and an outlet 6, said jacket constituting a combustion' chamber having an outlet for the products of combustion through the; top. The lower end of'one wall of the jacket, as shown at 8, is extended beyond the other wall of the jacket and provided withcircumferentially disposed openings 9 and arranged with portions 10 to support the heater, the lower end 'of the combustion chamber being closed to serve as a drip. pan.

A heating unit 1s arranged within the jacket consisting of a fiat circular chamber 11 connected to the water jacket, as at 12, adjacent the inlet to the latter, an angular chamber 13 being superposed to and connected in circulation with the chamber 11 and a flat circular chamber 14: superposed tothe chamber 13, said chamber 14 having an outlet adjacent the outlet 6 of the water.

jacket. r v As stated it is an object of the invention to provide an improved burner for gaseous fuel which is particularly adapted for use in connection with instantaneous water heaters, and have shown an applicatlonof my invention 1n connection with such a heater in Figure 1 as just'described. This burner comprises a valve chamber 15 having a threaded nipple 16 .for connection with a pipe 17 to connect the same with a source of fuel supply. Thechamber 15 has an outlet in a nip le 18 opposite to, the

nipple 16 having a et 19 with a restricted outlet connected thereto, which outlet is controlled by a valve shown in a general way at 20. The flow of gas through chamber 15 is controlled by a plug valve 20arranged with the usual operating handle. The jet 19 leads into one end of a tubular mixing chamber comprising sections 22, 23,

which are longitudinally separable by providing one section, shown as section 22, with an'enlargement 24 for the engagement of the section 23 and the latter secured therein by a set screw 25. The section 22 is connected to the threaded nipple 18 of the valve chamber and has a series of circumferential openings 26 circularly arranged around and adjacent the outlet of the jet 19 in the chamber to provide an air supply, which is in the nature of a primary air supply to said chamber, The area of these openings is regulated by a sleeve 27 slidably mounted on the chamber section 22. The opening and closing of the openings or ports 26 is controlled by and in accordance with the gas supply to the chamber so that the air supply will be in predetermined proprtion to the gas supply. For this purpose the sleeve is operatively connected to the valve 21 by a link 28 connected at one endto the sleeve and at the other end to the valve eccentric ef the axis thereof, as shown at 29. By this arrangement when the gas is shut off the openings are closed, and as the gasis turned off the opening of the air inlet ports is proportionate with the opening of' the gas inlet.

The; burner engages below the bottom of the heater with an angular portion 30 of the chamber section 23 passing through an. opening in the bottom of the heater and extending thereintofto direct the flame against the chamber of the heating unit. By the arrangement of the inlets to the combustion chamber there is provided an air supply at the burner outlet or point of combustion of the fuel which increases the flame propagation. However, as the flame is relatively large this air supply is onlyat the outer side of the flame or combustible fuel with the result that there is incomplete combustion of the fuel cent-rally of the burner outlet. To supply a secondary air supply to the combustible fuel at the burner outlet a tube 31 having a restricted opening relative to the mixing chamber leads from the exterior of the chamber to the interior thereof and has an outlet centrally of and adjacent the outlet of but at a point within the burner where combustion of fuel takes place at the burneroutlet whereby a portion of the air is supplied to the fuel mixture before it is ignited and a portion supplied to the fuel mixture during the combustion thereof. This tube has a restricted passage relative to the burner and in the present instance ;leads into the chamber at the bend of the angular portion 30 and extending centrally into the angular portion. It will be obvious that by this arrangement a supply of air will be provided centrally of the combustible fuel which will induce complete complete: combustion of the fuel.

Having thus described my invention I claim:

'In a burner for gaseous fuel, an angularly 9 formed mixing chamber of substantially the same cross sectional dimension throughout having an outlet at one end to constitutethe burner port "and having circumferentially disposed air inlet ports adjacent the op- 00 posite end; a tube extending from the exterior to the interior of the mixing chamber at the bend o f the angularportion with the outlet of said tube adjacentto and at a point within the burner port of the mixing chamher; a valve chamber connected to the end of the mixing chamber at which circumferential ports are locatedwhaving an inlet arranged to be connected to a gas supply and an outlet into the mixing chamber; a

valve in said valve chamber to control the gas supply to the mixingchamber; a sleeve slidably mounted upon the mixing chamber v 1 adjustable to regulate the size of the circumferential air inlet ports and air supply to the mixing chamber; a connection between said sleeve and gas control valve whereby to simultaneously actuate both the valve and sleeve to open and shut ofithe air supply to the mixing chamber and regulate the supply of one proportionally to the other; a nipple connected to the outlet ofthe valve chamber extending into the mixing chamber;

and a valve to regulate the gas supply from the nipple to the mixing chamber indes5 

